diff --git a/entrypoint.sh b/entrypoint.sh
index 49756ed..9dc7387 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,10 +1,10 @@
 #!/bin/sh
 
-cd "$GITHUB_WORKSPACE"
+cd "${GITHUB_WORKSPACE}" || exit
 
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 
-if [ "${INPUT_REPORTER}" == 'github-pr-review' ]; then
+if [ "${INPUT_REPORTER}" = 'github-pr-review' ]; then
   # erroformat: https://git.io/JeGMU
   shellcheck -f json  ${INPUT_SHELLCHECK_FLAGS:-'--external-sources'} $(find "${INPUT_PATH:-'.'}" -not -path "${INPUT_EXCLUDE}" -type f -name "${INPUT_PATTERN:-'*.sh'}") \
     | jq -r '.[] | "\(.file):\(.line):\(.column):\(.level):\(.message) [SC\(.code)](https://github.com/koalaman/shellcheck/wiki/SC\(.code))"' \
diff --git a/testdata/test.sh b/testdata/test.sh
new file mode 100644
index 0000000..d520aae
--- /dev/null
+++ b/testdata/test.sh
@@ -0,0 +1,2 @@
+echo $1                           # Unquoted variables
+find . -name *.ogg                # Unquoted find/grep patterns